Georgia Science Grade 6

Chapter 18: Ocean Motion

CRCT Practice

1
Which ion makes up 7.7 percent of the ions in seawater?
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A)calcium
B)sulfate
C)chloride
D)sodium
2
Which of the following dissolved gases enters ocean water both from the atmosphere and from organisms that photosynthesize?
A)carbon
B)nitrogen
C)hydrogen
D)oxygen
3
Which of the following terms is used to describe the amount of dissolved salts in seawater?
A)density
B)temperature
C)salinity
D)buoyancy
4
What is the direction of ocean currents in the southern hemisphere?
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A)counterclockwise
B)north to south only
C)clockwise
D)east to west only
5
Which of the following is a reasonable conclusion based on the information in the figure?
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A)The oceans' currents only flow in one direction.
B)The oceans' waters are constantly in motion.
C)The Gulf Stream flows east to west.
D)The Atlantic Ocean is deep.
6
Which of the following describes upwelling?
A)horizontal ocean circulation that brings deep, cold water to the surface
B)vertical ocean circulation that brings deep, warm water to the surface
C)horizontal ocean circulation that brings deep, warm water to the surface
D)vertical ocean circulation that brings deep, cold water to the surface
7
What affects surface currents?
A)crests
B)upwellings
C)the Coriolis effect
D)tides
8
Which type of tide occurs when the Sun, the Moon, and Earth are aligned?
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A)low tide
B)high tide
C)neap tide
D)spring tide
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